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Universal Century

Universal Century, often abbreviated as "UC", is the English name for the original timeline of the Gundam metaseries. Its Japanese name is "Uchuu Seiki", meaning "The Era of Space". The Universal Century remains by far the most developed timeline, with four TV series, four OVA series, fifteen theatrical releases, and various specials.

Mars Century, abbreviated as "MC", is a continuation of the After Colony timeline used on Mars. The story takes place within the Mars Sphere and is broken up with flashbacks of the After Colony era's history.

The After Colony timeline is the third most developed, with one TV series, one OVA series and a compilation movie. Mars Century consists of one novel.

After War

After War is the timeline set after an apocalyptic war world, and has many similarities with the Universal Century. After War is the only timeline, besides the U.C., to feature Newtypes as an important element.

Correct Century

The Correct Century is the timeline used in ∀ Gundam. Its Japanese name, 'Seireki', is a wordplay on the Japanese term for the Common Era (C.E.) Western calendar system (西暦; also pronounced Seireki). Its kanji literally means "Correct Calendar".

Cosmic Era

Cosmic Era (often abbreviated as "C.E.") is the timeline of the Gundam SEED series. It is the only Gundam timeline after the original Universal Century with multiple TV series. It is also the second most developed, with two TV series, one ONA and two compilation movies.

Advanced Generation

The Advanced Generation (often abbreviated as "AG" or "A.G.") is the timeline of the Gundam Age. Gundam Age is set several hundred years since mankind had migrated into space and living inside space colonies. Wars on Earth had long ended, and the world seems to be in a peaceful era.